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Torque ripple seriously affects the performance of brushless DC machine (BLDCM). Analyzed the principle of current hysteresis controller reducing non-commutation phase current which made BLDCM system become more hysteretic, the precise model of BLDCM is difficult to obtain. The fuzzy-PID control based on current hysteresis controller was proposed to diminish torque ripple and overcome the shortcomings...
Direct Torque Control of induction machines is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme has two major disadvantageous namely variable inverter switching frequency and high torque ripple. These problems occur due to the use of hysteresis comparators in the conventional DTC scheme, particularly in controlling the output torque. This...
In this paper the theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) is investigated. The effect of zero voltage vectors on the performances of the PMSM DTC drives is analyzed. Different from the conventional switching table eliminating zero voltage vectors, a novel switching table using zero voltage vectors is proposed. Simulation results show that the PMSM DTC drives...
The purpose of this paper is to compare two different techniques to adjust the reference torque in a speed control loop for variable speed control of switched reluctance machine. The first technique is "instantaneous", i.e., the torque is instantaneously regulated to fit the reference by modulating the current profile with respect to rotor position using the electromagnetic torque characteristics...
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